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Cloud Drift Wind Data-3DVAR and the Application in Typhoon Experiments

Author: LiNing
Tutor: ShenTongLiï¼›ZuoJinZhong
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Cloud motion winds Three - dimensional variational data assimilation WRF Landfall Typhoon Rainstorm Numerical Simulation
CLC: P457.8
Type: Master's thesis
Year: 2007
Downloads: 240
Quote: 4
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Abstract


China is a typhoon-prone country, the highest in the top ten natural disasters in the first year due to losses caused by the typhoon disaster. Brought by typhoon disasters are generally caused by the before and after its landing, the past due to the limited detection technology and maritime observations typhoon landed. In recent years, with the development of atmospheric sounding technology, the application of a series of high spatial and temporal resolution of meteorological satellite cloud track wind data unconventional information to make up for the lack of ocean observations using assimilation method applied to the mode unconventional data , can effectively improve the initial field mode. Select the very large impact on our two typhoons cases: the 0509 typhoon Matsa and 0604 strong tropical storm \cloud track wind data, speech infrared channel and the water vapor channel using the WRF model three-dimensional variational data assimilation system introduction of cloud motion winds mode, to improve the effect of cloud track wind data of the different channels of the initial field, in based on the path of the typhoon, rainfall, maintaining mechanism diagnostic analysis, to explore the application of cloud motion winds in typhoon forecasting experiments. Cloud track wind data assimilation of two channels at the same time the beginning of Typhoon Matsa guess the most obvious improvement field, the assimilation only one channel, the water vapor channel improvement is slightly better than the infrared channel temperature and pressure and wind fields. \serious rainstorm, the introduction of the assimilation of cloud motion winds, Bilis large-scale environmental flow improvement, especially on the position and strength of the subtropical high, high pressure center, compared to the control test improved. The improvement of the wind farm is mainly in the middle and upper parts of the troposphere. Bilis has the asymmetric structure, heavy rain occurred in the south side of the storm, the southwest monsoon provides abundant moisture conditions, heavy precipitation are maintained. Rain area over the strong convective motion, good dynamic lifting conditions, better relationship the divergence area with the rain of the low-level positive vorticity large value area and altitude.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Weather Forecast > Main meteorological elements of weather phenomena and forecasting > Tropical cyclones, typhoons, hurricanes forecast
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